Buckhammer, In a nutshell... TIME is the only reason I choose COM first with a follow up head shot. I can, in less time, acquire COM in my sights. My first 2 shots are to be rapid fired... I won't even know if the first shot was enough. But following the second shot I expect the threat to have deviated from his initial itinerary at least a little bit. If still making forward progress I have my gun raised already and have assessed the situation while looking down the barrel which is still up and ready and easily pointed for a head shot... *hopefully*...
Brent